kgsl_pwrscale_ondemand.c: remove statistics and refactor sysfs

- statistics were only for debugging
- nice clean way to unify sysfs

Signed-off-by: SkipXS <sskkiipp@gmail.com>
Revert "msm: acpuclock-krait: Use standard regulator APIs during CPU Hotplug"

This reverts commit ed10865248855ece7bd382680deeec2ea0a5e616.
Revert "Merge "msm: saw-regulator: Support enable and disable""

This reverts commit a9d2b7f4750e15437bf1dc345999fac90529f0ef.
Revert "kgsl_pwrctrl.c: change pwr->default_pwrlevel"

This reverts commit bfd633cfaae7ee17c3d35e08b841809405df4ebd.
cpufreq_ondemand.c: simplify sysfs code

Signed-off-by: SkipXS <sskkiipp@gmail.com>